低合金钢TMCP中相变热力学/动力学相关性探讨<sup>*</sup>

doi:10.11900/0412.1961.2016.00341

金属学报

2016, Vol. 52

Issue (10): 1326-1332 DOI: 10.11900/0412.1961.2016.00341

本期目录 | 过刊浏览

低合金钢TMCP中相变热力学/动力学相关性探讨^*

刘峰(

),王慷

西北工业大学凝固技术国家重点实验室, 西安 710072

DISCUSSIONS ON THE CORRELATION BETWEEN THERMODYNAMICS AND KINETICS DURING THE PHASE TRANSFORMATIONS IN THE TMCP OF LOW-ALLOY STEELS

Feng LIU(

),Kang WANG

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

引用本文:

刘峰, 王慷. 低合金钢TMCP中相变热力学/动力学相关性探讨^*[J]. 金属学报, 2016, 52(10): 1326-1332.
Feng LIU, Kang WANG. DISCUSSIONS ON THE CORRELATION BETWEEN THERMODYNAMICS AND KINETICS DURING THE PHASE TRANSFORMATIONS IN THE TMCP OF LOW-ALLOY STEELS[J]. Acta Metall Sin, 2016, 52(10): 1326-1332.

全文: PDF(1513 KB) HTML

摘要:

基于经典相变理论, 分析相变中关键热力学/动力学参量, 提出相变热力学/动力学相关性概念; 结合低合金钢控制轧制与控制冷却工艺(TMCP)涉及相变的实验研究, 总结热力学驱动力、动力学能垒与相变条件间关联; 进而探讨相变中热力学/动力学相关性; 最后对热力学/动力学相关性的潜在应用进行了展望.

关键词 ：低合金钢, 相变, 热力学, 动力学, 相关性

Abstract：

Thermo-mechanical control process (TMCP) plays a key role in the manufacturing of hot-rolled low-alloy steels, as well as the optimization of microstructures and properties. However, the various phase transformations involved in the TMCP of steels and its impact on the microstructures/properties are still not fully understood. In the present work, on the basis of classical theories of phase transformations and previous experimental results, the key parameters controlling the phase transformation processes are analyzed, from which the correlation between thermodynamics and kinetics of the phase transformations are proposed; then, this correlation in the phase transformations of low-alloy steels and its effect on the competing mechanisms of transformations are analyzed; based on well-established theories (i.e. the first-principles calculations and the double well potential in phase field methods), the energetics of the Bain path of Na and the fcc/bcc transformation of Fe are calculated to demonstrate the correlation between thermodynamics and kinetics. Eventually, the current work is summarized and the potential applications of the correlation between thermodynamics and kinetics of phase transformations are proposed.

Key words： low-alloy steel phase transformation thermodynamics kinetics correlation

收稿日期: 2016-08-01

ZTFLH:

基金资助:* 国家自然科学基金项目51431008和凝固技术国家重点实验室自主研究课题项目117-TZ-2015资助

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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00341 或 https://www.ams.org.cn/CN/Y2016/V52/I10/1326

图1 Fe-0.2C-1Mn-1Si 低合金钢经1050 ℃等温5 min之后以不同冷速冷却到室温时的马氏体组织

图2 金属Na的Bain转变过程中能量变化受体积影响

图3 基于相场法双阱势函数分析纯Fe的fcc/bcc转变的界面能量变化

图4 TMCP调控中加工条件-相变理论-组织性能一体化和定量化研究的逻辑关系图

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